Introduction to jython
Upcoming SlideShare
Loading in...5
×

Like this? Share it with your network

Share
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
398
On Slideshare
396
From Embeds
2
Number of Embeds
1

Actions

Shares
Downloads
1
Comments
0
Likes
0

Embeds 2

https://www.udemy.com 2

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. INTRODUCTION TO JYTHON John Saturday, December 21, 2013
  • 2. The reason for Jython • Access Java class library • Embed in Java app servers • Mix and match Python and Java code
  • 3. Install and configure Jython • Download the jar file from www.jython.org/downloads.html • download the jar file (latest version is jython.2.7 alpha,which means you will have all same feature as Python 2.7) • Add “C:jython2.7a2” into the path, the file jython.bat is the executable file
  • 4. Attention: if you met problems in the interactive console if you met this problem • Code never end if input a string Use chcp solve it Input command on line $ chcp 437
  • 5. import Java built-in classes Use HashMap java class covert HashMap to dict >>> from java.util import HashMap >>> a = HashMap() >>> a. get(“key”,1) >>> a {key=1} >>> type(a) <type ‘java.util.HashMap’> >>> d = dict() >>> d.update(a) >>> print d {u’key’:1}
  • 6. More examples Call java swing libaray from javax.swing import * frame = JFrame(“Hello,Jython”) label = JLabel(“Hello Jython!”,JLabel.CENTER) frame.add(label) frame.setDefaultCloseOperation(JFra me.EXIT_ON_CLOSE) frame.setSize(200,100) frame.close()
  • 7. Mix Java and Python Step 1: write java class in java file Step 2: compile it and add it to CLASSPATH #file Foo.java public class Foo { public String stuff(int x) { String buf = new String(“Test from Java:”); buf = buf + Integer.toString(x); return buf } } #Compile the java code #A Foo.class will be generated if java code have no error $ javac Foo.java #Build the jar file Foo.jar $ jar cvf Foo.jar Foo.class #update the CLASSPATH on windows $ set CLASSPATH = %CLASSPATH% C:/Foo.jar; #use echo view the change $ echo %CLASSPATH%
  • 8. Use Java class in Python import the Foo class Inherit the Foo class >>> import Foo >>> f = Foo() >>> type(f) <type ‘Foo’> >>> f.stuff(123) u’This is a test from Java:123’ >>> class Bar(Foo): def blah(self,x): print “python, about to do Java” print self.stuff(x) print “And back to Python” >>> b = Bar() >>> b.blah(123) Python, about to do Java This is a test from Java: 123 And back to Python